'Kings' in the Bible

At that time we took their land from the two kings of the Amorites on the far side of Jordan, from the valley of the Arnon to Mount Hermon;

And I gave orders to Joshua at that time, saying, Your eyes have seen what the Lord your God has done to these two kings: so will the Lord do to all the kingdoms into which you come.

And they took his land for a heritage, and the land of Og, king of Bashan, the two kings of the Amorites, whose lands were on the other side of Jordan to the east;

He will give their kings into your hands, and you will put their names out of existence under heaven; there is not one of them who will not give way before you, till their destruction is complete.

The Lord will do to them as he did to Sihon and to Og, the kings of the Amorites, and to their land, whom he put to destruction.